different Earths for Cafhvn. 277 



94 grains, and equal to 47 per cent* The proportion of 

 iron revived in this experiment exceeds 3 grains for each 

 grain of carbon. The surface of the glass was striated, of a 

 blueish white pearly colour. The fracture, however; resem- 

 bled the glasses obtained in Experiments III, IV, and V* 

 A few faint impressions of crystallization were observable 

 upon the under surface of the metallic button. This al- 

 ways indicates a combination of carbon, and uniformly an- 

 nounces a change to the state of steel* 



VII. 200 grains of oxide, 



40 of carbon, or l-5th* 



This mixture was reduced in 15 minutes, and a perfect 

 metallic button obtained, which weighed 123 grains, equal 

 to 61 £ per cent* The quantity of metal revived was nearly 

 in the same proportion to charcoal as in the former experi-*. 

 ments. The quantity of glass was now considerably dimi- 

 nished, and was not sufficient to cover the upper surface of 

 the button. In point of colour and opacity, however, it 

 was not materially different from Exp. V and VI. The 

 quality of the revived iron was highly decarbonated, of a 

 white crystalline fracture. 



VIII. 200 grains of oxide*, 



50 H of carbon*, or l-4th. 



From the fusion of this mixture there resulted a partially 

 crystallized button of crude iron which weighed 140 grains, 

 Or equal to 70 per cent. The glass had entirely disappeared, 

 excepting a thin crust of a blackish green colour, attached 

 to the edges of the button. The proportion of iron revived 

 to carbon in this experiment is as 2f to 1. 



IX. 200 grains of oxide, 



60 — — ) of carbon* 



The fusion of this mixture yielded a very perfect metallic 

 button which weighed - - 140 grs. 



Globules of a silvery colour thrown against the 



sides of the cruciole - * 4 



144 

 Equal to 72 per cent. ■«■ — «! 



In this experiment only a very thin film of glass wa9 

 found of a light lead blue colour ; and, as there remained 

 untaken up 4 grains of the charcoal, it is presumable that 

 the whole contents in iron contained in the oxide> making 

 allowance for unavoidable loss, was now revived and col- 

 lected together. As the quality of the metal now obtained 

 Was still highly deficient in carbon, it appeared probable 



Vol. 19. No. 75. August \ 804. U that 



